Jennifer Aniston has started a pre-wedding diet and workout regimen to slim down ahead of her upcoming nuptials to actor Justin Theroux, the Independent reported.

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Like most brides, Aniston wants to look great in her wedding dress and get in the best shape possible. “She doesn’t think she’s overweight by any means,” said a source.

“But she’s always said that she feels most confident when she looks a certain way. And there’s no doubt she’ll want to have that same feeling on her wedding day. She has a lot of goals that she wants to achieve, and the biggest one at the moment is getting slim the old-fashioned way: through diet and exercise.”

The 5-foot-5 Aniston is in fantastic shape at 45, but recently said she wants to lose five pounds to reach her ideal weight of 110 to 113 pounds. "I would love to drop five pounds," Jennifer told Yahoo. "That is just where I have always been really comfortable at — about 110 to 113 pounds. But it is harder at this age."

Aniston, who previously followed the Zone diet, now embraces a low carb diet, and said her weight loss secrets include yoga and cardio exercise. Jennifer usually allows herself to enjoy bread and bagels on weekends, but doesn't go overboard. "I usually give myself bread on the weekends, but really, my body doesn't love carbs," she said.

Aniston, a longtime fitness fanatic, works out five to six days a week, combining yoga, spinning, running, strength-training and the elliptical trainer.

Jennifer has been a yoga devotee for more than 20 years, saying the meditative practice gives her lean muscles and quiets her mind. Aniston, who was 30 pounds heavier during her twenties, lost weight by overhauling her diet and making exercise a regular habit. Her career took off shortly afterward, and has yet to slow down.

Does Yoga To Calm Mind and Tone Body

Aniston does yoga three days a week with her longtime friend and yoga teacher, Mandy Ingber. Ingber told me in an exclusive interview that she and Jennifer combine cardio and toning exercises into their weekly workouts.

"We meet up about three times a week, and our sessions are 60 to 90 minutes," said Mandy. "We incorporate cardio and toners into the yoga sessions, much like I do in my Yogalosophy DVD."

While Jennifer works out to look good, she said exercise, especially yoga, is critical for emotional and mental health. "My ultimate stress reliever is exercise!" said Aniston. "If yoga didn't exist, I'd invent it."

Aniston said her anti-aging beauty secrets include drinking a lot of water, getting enough sleep, and a simple beauty routine that includes sunscreen and daily moisturizer. She said good genes also play a role. Aniston said she refuses to cave in to the Hollywood pressure to get loads of plastic surgery in a bid to look young forever. She said her fiance is vehemently opposed to her getting plastic surgery, and she's happy to oblige.

On Aug. 24, Jennifer completed the ALS Ice Bucket Challenge benefiting the ALS Association (see video above). Aniston's fiance, Justin Theroux, poured the freezing water over her head after issuing the challenge to her just days earlier.

Countless celebrities, from Tom Cruise to Anna Wintour to LeBron James, have completed the Ice Bucket Challenge, where participants either dump ice-cold water over their heads or donate $100 to support the ALS Association.

The viral social media stunt has raised more than $80 million so far. The ice bucket challenge seeks to raise research money for amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, a neurodegenerative disorder characterized by progressive muscle paralysis and early death. There is no cure.

However, one celebrity standout is vegan animal-rights activist Pamela Anderson, who refused the challenge because of the animal testing that's done for ALS research. Anderson issued her own challenge to the ALS, asking them to stop cruel animal laboratory experiments.

"Sorry, I can't bring myself to do your Ice bucket challenge," said Pam. "I'd challenge ALS to stop animal testing. Recent experiments funded by the ALS Association, mice had holes drilled into their skulls, were inflicted with crippling illnesses, and were forced to run on an inclined treadmill until they collapsed from exhaustion. What is the result of these experiments (other than a lot of suffering)?"

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Samantha Chang is the co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.